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1 How long does unopened sour cream last after the sell-by date? 2  Sour cream will generally keep for one to two weeks after the sell-by date on the package, assuming it has been continuously refrigerated; be sure that the temperature of your refrigerator remains at or below 40Â° Fahrenheit at all times.
Milk can be refrigerated 7 days; buttermilk, about 2 weeks. Milk or buttermilk may be frozen for about 3 months. Sour cream is safe in the refrigerator about 1 to 3 weeks but doesn't freeze well. For more information, you may call the FDA toll-free at (888) 723-3366 or go to FDA 's Web site.